A new method for the determination of intersystem crossing quantum yields. Application to benzene and its methyl derivatives

1976 ◽  
Vol 98 (1) ◽  
pp. 1-6 ◽  
Author(s):  
Felix A. Carroll ◽  
Frank H. Quina
Keyword(s):  
New Method ◽  
Quantum Yields ◽  
Intersystem Crossing ◽  
Methyl Derivatives

Luminescence of 5-Phenyltetrazole and its Derivatives. Part II. Phosphorescence

1984 ◽  
Vol 39 (6) ◽  
pp. 556-559 ◽  
Author(s):  
I. Gryczyński ◽  
A. Kawski ◽  
Z. Grzonka ◽  
A. Rażyńska
Keyword(s):  
Triplet State ◽  
Quantum Yields ◽  
Intersystem Crossing ◽  
Thermal Deactivation ◽  
Fluorescence Quantum Yields ◽  
Radiative Transitions ◽  
Polyvinyl Alcohol Film ◽  
Methyl Derivatives ◽  
Temperature Responses ◽  
Phosphorescence Spectra

The phosphorescence spectra, mean lifetimes of phosphorescence and ratios of phosphorescence/ fluorescence quantum yields have been measured for 5-phenyltetrazole and its three methyl derivatives in a polyvinyl alcohol film over the temperature range of (77-250) K. Temperature responses of the non-radiative intersystem crossing constant. KST, and the non-radiative triplet state deactivation constant, km, have been investigated on the basis of these measurements. The energy of activation for the non-radiative transitions has been determined. With the methyl 5-phenyltetrazoles, the thermal deactivation of the triplet state, contrary to the intersystem crossing, has been found to be influenced by the position of the methyl substituent in the phenyl ring.

Novel Experimental Technique for the Absolute Determination of Quantum Yields

1998 ◽  
Vol 52 (8) ◽  
pp. 1103-1110
Author(s):  
G. Kaindl ◽  
R. Weger ◽  
P. Bajons
Keyword(s):  
Quantum Yield ◽  
Light Emission ◽  
Practical Method ◽  
New Method ◽  
Quantum Yields ◽  
Absolute Determination ◽  
Exciting Wavelength ◽  
Fluorescence Light ◽  
The Absolute

A new method for the absolute determination of the quantum yield based on the trapping of fluorescence light within a cylinder is discussed. First the trapping probability of photons—which are emitted in transparent rods or fluid-filled tubes—is investigated theoretically. The studies are based on the extension of light governed by the laws of reflection and refraction. The effect of nonhomogeneous distribution of the centers of fluorescence light emission on the calculation procedures is taken into account. Then the adaptation of the theoretical results to a new practical method is shown. The quantum yield as a function of the exciting wavelength is determined in one experimental cycle. The discussion of the method is performed by measurements on fluorescein in aqueous solution. The results are compared to literature data. The conformity demonstrates the applicability of the new method.

ChemInform Abstract: NEW METHOD FOR THE DETERMINATION OF QUANTUM YIELDS OF THE PHOTOISOMERIZATION OF PHOTOCHROMIC EPOXYDIARYLINDANONES

1984 ◽  
Vol 15 (30) ◽  
Author(s):  
V. M. ZOLIN ◽  
N. D. DMITRIEVA ◽  
YU. E. GERASIMENKO ◽  
A. V. ZUBKOV
Keyword(s):  
New Method ◽  
Quantum Yields

New method for the determination of the quantum yields in the photo-isomerization of photochromic epoxydiarylindanones

1984 ◽  
Vol 20 (2) ◽  
pp. 132-135
Author(s):  
V. M. Zolin ◽  
N. D. Dmitrieva ◽  
Yu. E. Gerasimenko ◽  
A. V. Zubkov
Keyword(s):  
New Method ◽  
Quantum Yields

A new method for the determination of nitrates

1960 ◽  
Vol 23 ◽  
pp. 227-232 ◽  
Author(s):  
P WEST ◽  
G LYLES
Keyword(s):  
New Method
Sign in / Sign up

Export Citation Format

Share Document